Assumptions With OISS Reconnaissance: The following assumptions can
be made when
reconnaissance is being planned:
Every coast will be different or unique.
Every coast will vary relative to geographical or physical layout.
Coastal soil will vary (for example, soft sand, boulders, rocky, lava beds).
Coastal surf turbulence will be unavoidable.
Coastal tidal fluctuations will vary as much as 200 feet.
Distance of water level from purification site will be limited by equipment.
When performing the reconnaissance, the water supply section leader should ensure a representative
from the command surgeon is present.
Table 1-4. Raw water constituents (maximum allowable) water quality standards
Physical and Chemical:
4 - 10 units
1 x (10)6 per 100 ML
(as measured with the membrane
Gross beta activity
Development of Seawater Sources. You need to consider the following factors when developing
seawater sources: surf action, saltwater corrosion, suspended sand and silt in the water, living organisms,
surface oil along beaches, and the rise and fall of the water level with the tide. In arctic regions, another
factor to consider is the potential for damage to raw water supply lines from ice floes washing onto the
beach. In all regions, if possible, locate RO equipment in sheltered bays, harbors, lagoons, or inlets. You can
supply raw water by intakes constructed the same as surface intakes for freshwater. On open beaches and
small islands, there are a variety of different types of intakes that can be constructed.
One type is the saltwater or beach well. These wells can be dug to tap brackish or salt groundwater
(Table 1-5). In some areas, these wells may be dug deep enough to tap into freshwater aquifers. They are
preferred to offshore intakes, for they eliminate the problems caused by tides, surf, and shallow waters near